Question

Sun lei bought a computer for $1800. The total cost, including tax, came to $1890. What is the tax rate?

Answer 1

Given:

Cost of computer without tax $1800.

Total cost including tax is $1890

`\text{Tax amount =1890-1800}`
`\text{Tax amount = \$90}`

Let the tax rate be x

`90=1800*(x)/(100)`
`(90)/(18)=x`
`x=5`

Tax rate is 5%